Register
We use the term ‘register’ to refer to particular varieties or styles of speaking and writing. Registers vary because the language is used for different purposes, in different contexts and for different audiences. For example, there is a legal register, a register of advertising, registers of banking and a register of weather forecasting. We commonly recognise registers because of their specialised vocabulary but also because of particular uses of grammar. We also use the term register to refer to whether language is being used formally or informally: …

informal | American Dictionary

informal
adjective
us/ɪnˈfɔr·məl/
not formal or official, or not suitable for official or special occasions:
an informal gathering
Informal talks resumed today in an attempt to end the strike.

informality

noun[ U ]us/ˌɪn·fɔrˈmæl··t̬i/

informally

adverbus/ɪnˈfɔr·mə·li/
It’s OK to dress informally for the dinner party.

Examples of informal

informal
We replaced one of the scheduled formal discussions with two parallel informal discussions in the day room to explore the impact of context.
An individual is supposed to be influenced by these aspects of informal and formal care when striving toward an optimal formal-informal care mix.
In addition to the theoretical grammar testing described above, we also plan an informal evaluation of the usability of the system.
Theoretical linguists may wish for a stronger framework or tighter structure, but the book's informal style is more likely to attract and educate the public.
We have focused on features because our informal analysis has revealed that that is what people typically do.
As an informal register, comic strips characteristically draw on colloquialisms, phonetic spellings, etc., to convey oral concepts in print.
However, a short period of informal care may be preferred over a short period of formal care, because of relational aspects, for instance.
This varies from de jure recognition (by a small number of countries) to de facto informal linkages.
This formal acknowledgement of informal carers as principal providers of support was seen as a recognition that was somewhat overdue.
For the purposes of the model, people with no dependency are not regarded as receiving informal care.
This is possibly the most striking part of the dialect, especially at its most informal.
Another informal source of midwifery knowledge would have been relatives who practised midwifery or medicine.
Yet in both countries, relatively more women than men did not expect informal care when it might become necessary in the future.
For the 983 respondents without care at t0, logistic regression models were used to predict the transition to informal home-care at t1.
As few respondents used both formal and informal help (<5 % in all four countries), they were added to the 'formal help' category.
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.